MBSS Site Summary for: NASS-108-S-2005


Located on Millville Creek in the Nassawango Creek watershed, 8-digit code: 02130205.
This stream was visited in the spring on 4/12/2005 and again in the summer on 8/30/2005.

Index of Biotic Integrity (IBI) Results:

An Index of Biotic Integrity (IBI) is a scientific tool used to identify and classify stream health. An IBI associates anthropogenic influences on a stream or with biological condition in the stream, and is formulated using data developed from biosurveys.
Details on the development and application of MBSS IBIs are in this document.
Fish IBI Poor - 2.0 / 5.0
Benthic IBI Poor - 2.4 / 5.0

Land Use

Land use can provide important information for determining stream health.
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Catchment area 3,382 acres A stream flowing through a densely forested area. An example of a forested stream.
Urban Land Use 0.9 %
Agricultural Land Use 15.2 %
Forested Land Use 78.1 %


Stream showing woody debris, logs, and rocky substrate.
An example of woody debris in a stream.

Physical Stream Habitat
Instream Habitat 7/20 (Marginal)
Epifaunal Substrate 9/20 (Marginal)
Velocity/Depth Diversity 5/20 (Poor)
Pool Quality
Pool Extent = 50 meters 		7/20 (Marginal)
Riffle Quality
Riffle Extent = 0 meters 		0/20 (Poor)
Shading 95 %
Embeddedness 100 %
The embeddedness, a measure of silt on the stream bottom, was 100%. This is very high, and may adversely affect biotic communities.


Stream Water Quality:
Water temperature 22.1 ° C
Dissolved oxygen (DO) 3 mg/L
Dissolved oxygen levels measured in the stream were very low (3 mg/L). Many fishes and other aquatic animals cannot tolerate low levels of oxygen in the water.
pH (lab) 4.43
Conductivity 57 µmho/cm
Alkalinity
(acid neutralizing capacity) 		-47.95913 µeq/L
Dissolved organic carbon (DOC) 35.4544 mg/L

Biological Stream Condition:

Surveys of the organisms living within a stream can give indications of stream health. Species richness, or the number of different species present, as well as indicator species (species whose presence, absence or abundance can serve as a measure of environmental conditions) are informative for stream health. 		Close-up of a mayfly indicator species.

Fish Survey Results:
The following 3 fish species were collected.
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Common name Count
Eastern Mudminnow 2184
Pirate Perch 79
Redfin Pickerel 42
Biologists sampling fish communities.
Electrofishing to sample fish communities.

Amphibians and Reptiles:
American Bullfrog
Northern Green Frog

Crayfish:
No crayfish noted.

Exotic Plants:
No exotic plants noted.
 

Benthic Macroinvertebrates:
Sensitive taxa: Green, Tolerant: Red, Intermediate: Gold.
Genus/Family Common Name Count
Simulium Black Fly 42
Parakiefferiella European Non-Biting Midge 20
Caecidotea Isopod 14
Zalutschia Non-Biting Midge 14
Tribelos Non-Biting Midges 4
Crangonyctidae Scud 4
Prostoia Spring Stonefly 2
Ceratopogonidae Biting Midge 2
Polypedilum Non-Biting Midges 2
Parachironomus 2
Synurella Amphipod 2
Tubificidae Aquatic Worm 1
Isotomurus Elongate-Bodied Springtail 1
Tanytarsus Non-Biting Midges 1
Orthocladiinae Midge 1
Lumbriculidae Worm 1
Ironoquia Northern Caddisfly 1
Kick net sampling for macroinvertebrates.
Sampling with a kick net.

Information disclaimer: The information and data on this page is for guidance and general planning purposes only. It should not be used to make decisions on specific matters.